There's a huge list of freeware sequencers at the Bedroom Producers Blog that may worth a look (with some comments by the blog author). Since I can't post links here, do a Google search with the words:

bpb free vst host aplication roundup

Personally, I found most of them hard to use and, work properly or too crippled. I use Psycle, but I must confess it's a love/hate relationship.